black iron pipe and galvanic reaction?

I am trying to suspend 40 ft of black iron piping in the basement, and I want to use 1" steel U brackets... this shouldn't cause a galvanic reaction should it? steel and iron are similar metals. am I right on this idea? don't want the gas line to corrode over time.....

this would be more of a problem if I say suppended a copper line with iron brackets right? that's why you use the rubber coated hangers for copper lines isn't it?